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See Chinese contents: JB/T 56078-1996 JB/T 56078-1996: Large Hydraulic Turbine - Grading of Product Quality
This Standard is applicable to the mixed-flow hydraulic turbine, ramp-flow hydraulic turbine, axial-flow hydraulic turbine (tubular hydraulic turbine refers to axial-flow) and scoop hydraulic turbine of which the power exceeds 10 MW; the butterfly valve of which the nominal diameter is 1000~8000 mm; and the rotary valve of which the nominal diameter is 500~2400 mm.
